Michael,

Here is where to look. Front Fender eyebrows, fender tips near doors, bottom of doors, door hinge pockets, steps, cab corners. Those are common.

Eric
http://s1199.photobucket.com/user/sparky234/library/My%2057%20Chevy%20Stepside?sort=3&page=1
'57 Chevy 3100 (Little Red)
'81 RD350 LC - Fun, Fun, Fun
'83 GS1100E - Pocket Rocket